Examine source code of Rule 1599

{
  "theme": {
    "images": {
      "theme_frame": "cellular_header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Rule 1599",
  "manifest_version": 2,
  "description": "Based on a 1D totalistic cellular automaton called Rule 1599.  Such cellular automata were discovered by Stephen Wolfram.  This picture was generated in Mathematica."
}